double Division(int a, int b) 
{
	 // 当b == 0时抛出异常
	 if (b == 0)
	 	throw "Division by zero condition!";
	 else
	 	return ((double)a / (double)b);
}
void Func()
{
	 int len, time;
	 cin >> len >> time;
	 cout << Division(len, time) << endl; 
}

int main()
{
	 try {
	 	Func();
	 }
	 catch (const char* errmsg） {
	 	cout << errmsg << endl;
	 }
	 catch(...){
	 	cout<<"unkown exception"<<endl; 
	 }
 
 	return 0; 
}

